Reactor Coolant


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Reactor Coolant

 

a liquid or gaseous substance that is passed through the core of a nuclear reactor and removes from the core the heat released as a result of the fission reaction.

In power reactors, the coolant flows from the reactor to a steam generator, where steam is produced to drive the turbine. Alternatively, the coolant itself, whether steam or gas, may serve as the working fluid for driving the turbine. In research reactors, such as materials-testing reactors, and in special-purpose reactors, such as isotope-production reactors, coolants are used only to remove heat from the core.

Reactor coolants must meet the following requirements: small neutron-absorption cross section (in thermal reactors), low moderation of neutrons (in fast reactors), chemical stability under conditions of intense irradiation, low corrosiveness with respect to the structural materials with which the coolant is in contact, high heat-transfer coefficient, high specific heat, and low working pressure at high temperatures.

In thermal reactors, the coolant used may be light water, heavy water, water vapor, an organic liquid, or carbon dioxide. The coolants employed in fast reactors include liquid metals— primarily sodium—and gases, such as water vapor and helium. In many cases, the coolant also serves as a moderator.

S. A. SKVORTSOV

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The out-pile test conditions of a 110% reactor coolant flow amount resulted in a coolant flow-induced vibration having a frequency of about 11 Hz and complex vibration amplitude [6].
calculated pressure pulsation of a reactor coolant pump under low flow conditions.
(OTC: TOSYY), is the largest exporter involved in the transaction and will provide the reactor coolant pumps, reactor components, controls, engineering services, and training.
Westinghouse Electric Company LLC, a Pittsburgh, Pa.-based group company of Toshiba Corporation, is the largest exporter involved in the transaction and will provide the reactor coolant pumps, reactor components, controls, engineering services, and training.
Westinghouse Electric, a Pittsburgh-based group company of Toshiba, is the largest exporter involved in the transaction and will provide the reactor coolant pumps, reactor components, controls, engineering services, and training, Exim said.
International Resource News-April 17, 2012--Westinghouse Electric Company, Curtiss-Wright Corporation, and SNTPC completes qualification testing of AP1000(R) Reactor Coolant Pump(C)1994-2012 ENPublishing - http://www.enpublishing.co.uk
This Tuesday, July 12, NRC and Southern Nuclear officials will discuss the significance of the inspection finding, which involved the failure to maintain the proper configuration of a system that supplies oil to the reactor coolant pumps.
London, United Kingdom, March 16, 2011 --(PR.com)-- Advanced Design Technology, Ltd., or ADT, a global leader in the development of advanced turbomachinery design methods, is pleased to announce that Andritz Hydro AG, a global market leader for customised plants, process technologies, and services for the hydro-power, pulp and paper, metals and other industries, applied TURBOdesign1 - 3D inverse design code - for the design of a compact Reactor Coolant Pump (RCP) achieving higher efficiency and cavitation performance.
Among their topics are microbial quality of freshwater ecosystems of South America, the development of boiling water nuclear reactor coolant technology, domestic wastewater pollutant discharge and pollutant load and water quality in the ambient water in developed and developing countries, a case study from 2005-07 on monitoring the quality of water from shallow wells in Malawi, impacts of agriculture on water quality, and macrophytes as indicators of the quality and ecological status of waterbodies and for removing nutrients and metals.
Because the quantities of tritium in the reactor coolant are approaching regulatory limits, TVA has been significantly restricting the number of TPBARs that it will allow NNSA to irradiate in each 18-month reactor fueling cycle, and, consequently, NNSA has not been producing as much tritium as it planned.
Projects included analyzing the impact of a potential fire on equipment located in key areas of the plant, replacing the in-core instrumentation sensor system that monitors reactor fuel conditions, and removing and replacing a reactor coolant pump motor that weighs 57 tons.
The NCNR operates a 20 MW research reactor that provides a source of fission neutrons that have been moderated to thermal energies by the [D.sub.2]O primary reactor coolant. The peak core fluence rate is 4 X [10.sup.14] [cm.sup.-2][s.sup.-1].

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